Electric motor.



0 H. & A. F. PIEPER.

ELECTRIC MOTOR. APPLICATION FILED JUNE 21, 1909.

. \A l I 3 6 I W; Memes Patented Aug. 31, 1909.

erator and at the same time-lessen UNITED STATES PATENT onrion.

OSCAR H. PIEPER AND ALPBONSE I. PIEPEB, OF ROCHESTER, NEW YORK.

ELECTRIC MOTOR.

Specification of Letters Patent.

To all whom it may concern:

Be it known that we, OscAn H. PIEPER and ALP-HONSE F. PiEPER, ofRochester, in the county of Monroe and State of New York, have inventedcertain new and useful Improvements in Electric Motors or Generators;and I do hereby declare the following to be a full, clear, and exactdescription of the same, reference being had to the accompany ingdrawings, forming a part of this specification, and to thereference-numerals marked thereon.

The present invention relates to electrlc motors and generators and ithas for an object to provide a construction in which the members of alaminated field may be secured and held together firmly without beingperforated. I

To this and other ends the invention consists in certain improvementsand combinations of parts all as will be hereinafter more fullydescribed, the novel features being pointed out in the claims at the endof the specification.

In the drawings: Figure 1 is a sectional view of an electric motorconstructed in accordance with this invention; Fig. 2 is a detailsectional view; Fig. 3 is a side view, a-a indicatin the line on whichFig. 1 is taken, and -Z) indicating the line on which Fig. 2 is taken,and Fig. L is a detail sectional view of a modification of theinvention.

Electric motor and electric generator fields are often formed of aplurality of plates or disks united by passing bolts or tie membersthrough perforations therein. These tie bolts reduce the efliciency ofthe motor or generator either by generating eddy currents when insulatedor acting as the secondary of a transformer when uninsulated. In thisinvention the field plates or disks are secured together in such amanner that the perforation of the field and the use of tie bolts is notnecessary, making it possible to increase the efliciency of the motor orgenthe cost of manufacture thereof.

The invention is herein illustrated as embodiedin a dental motor andemploys, in Figs. 1 to 3, a casin or hollow drum 1 which is preferablyma e from flat stock and drawn or pressed into cylindrical shape with aninwardly turned annular flange or retaining device 2 at one end.Arranged within this drum is the field formed of a plurality of platesor disks 3 and held at one side of the flange 2. At the opposite side,the field is held by a retaining ring 4 which fits within the drum andis secured in position there in by bending or turning inwardly the edge5 of the drum.

In assembling the parts the field plates and retaining ring are fittedwithin the drum and pressed toward the flange 2. lVhen a sufiicientcompression has been obtained the edge 5 is bent inwardly to engage theretaining ring 4 in order to hold the disks 3 and ring 4 undercompression within the drum.

The armature 6 may be supported in bearings 7 and are carried bybrackets or supports 8 bolted or otherwise secured to the flange 2 andthe retaining ring 4; while the motor is supported by an inverted yokedframe 9 whose arms are attached to the drum by elbows 10. The conductorslead through the frame and the elbows and connect with the motor afterpassing through perforations 11 in opposite sides of the drum.

Instead of forming the retaining device 2 integral with the hollow drumit may be formed by a separate ring 2 held by bending inwardly the endof the drum to form a flange 2 (see Fig. 4). Of course, this retainingdevice may be utilized to holdonc of the supports 8.

e A motor or generator constructed in accordance with this invention isinexpensive to manufacture as the parts may be assembled very quicklyand the number of operations in manufacturing is reduced. It is notnecessary to perforate the field and employ tie bolts and consequentlygreater efficiency in the operation of the motor or generator isobtained.

lVe claim as our ihvention:

1. A motor or generator comprising a casin having a retaining device atone end, a field formed of disks fitted in the casing and held at oneside by the retaining device, and a retaining ring cofiperating with theopposite side of the field, the end of the casing opposite the retainingdevice being bent inwardly into engagement with the retaining ring tohold the latter and the field within the casing.

2. An electric motor or generator comprising a casing having a retainingdevice at one end, a field formed of disks compressed in the casingagainst said retaining device, and a field retaining ring alsocompressed within Patented Aug. 31, 1909.

said casing at the opposite end of the latter, latter opposite theretaining device being the metal of the said casing being bent intoengagementwith the ring to hold the latter and the field within thecasing under coin- 5 pression.

3. An electric motor or generator comprising a casing having a retainingdevice at one end, a field formed of a plurality of disks and held atone side by the retaining device,

10 a retaining ring holding the other side of the field and fitted inthe casing, the end of the bent inwardly to retain the ring Within thecasing, and armature bearing supports secured to the retaining deviceand to the 15 retalnlng ring.

OSCAR H. PIEPER. ALPHONSE F. PIEPER.

